When I have earworm, what helps me is listening to a whole original song. When I finish it, I don't have to sing it myself anymore. :)
Good songs? There are many... so I will write few I like:
Girl's day - Don't flirt; Expectation
T-Ara - Number 9
Punch, Chanyeol - Stay with me (from Goblin)
LiSA - Disillusion
Love O2O OST - One Alluring Smile (2016)
Look at a music section of country forums here on MDL. There are many songs mentioned.